Parkinson’s disease and Alzheimer’s disease are two completely different diseases. Parkinson’s disease is caused by a decrease in the production of a substance called dopamine in the brain. Alzheimer’s disease is a degenerative disease of the nervous system characterized by cognitive decline and memory loss. Parkinson’s disease, also known as tremor palsy, is a neurodegenerative disease that is characterized by motor and non-motor symptoms. Motor symptoms include resting tremor, muscle tonus, and bradykinesia, while non-motor symptoms include decreased sense of smell, sleep disturbances, numbness and pain in the limbs. It can be treated with medications such as levodopa tablets and pramipexole hydrochloride tablets. Alzheimer’s disease is also called Alzheimer’s disease. It is a neurodegenerative disease in which the patient is conscious but neurological function declines. Clinical symptoms are memory loss, easy to forget things in the near future, but remember things in the distant future very clearly. Symptoms can be relieved with medications such as memantine, donepezil, and pyridostigmine. Parkinson’s disease and Alzheimer’s disease are two kinds of diseases. Patients should go to the hospital for examination, and the doctor will decide what kind of disease it is according to the result of examination and symptoms. All medications should be used under a doctor’s supervision.